2012-11-15 12:06:41 +01:00
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/* $NetBSD: cpuset.c,v 1.18 2012/03/09 15:41:16 christos Exp $ */
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2011-02-14 20:36:03 +01:00
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STANDALONE
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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2012-11-15 12:06:41 +01:00
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__RCSID("$NetBSD: cpuset.c,v 1.18 2012/03/09 15:41:16 christos Exp $");
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2011-02-14 20:36:03 +01:00
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/sched.h>
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#ifdef _KERNEL
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#include <sys/kmem.h>
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#include <lib/libkern/libkern.h>
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#include <sys/atomic.h>
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#else
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/sysctl.h>
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#endif
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#define CPUSET_SHIFT 5
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#define CPUSET_MASK 31
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#define CPUSET_NENTRIES(nc) ((nc) > 32 ? ((nc) >> CPUSET_SHIFT) : 1)
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#ifndef __lint__
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#define CPUSET_SIZE(n) (sizeof( \
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struct { \
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uint32_t bits[0]; \
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}) + sizeof(uint32_t) * (n))
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#else
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#define CPUSET_SIZE(n) 0
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#endif
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struct _cpuset {
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uint32_t bits[0];
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};
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2012-11-15 12:06:41 +01:00
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#ifndef _KERNEL
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2011-02-14 20:36:03 +01:00
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static size_t cpuset_size = 0;
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static size_t cpuset_nentries = 0;
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size_t
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/*ARGSUSED*/
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_cpuset_size(const cpuset_t *c)
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{
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return cpuset_size;
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}
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void
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_cpuset_zero(cpuset_t *c)
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{
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memset(c->bits, 0, cpuset_nentries * sizeof(c->bits[0]));
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}
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int
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_cpuset_isset(cpuid_t i, const cpuset_t *c)
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{
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const unsigned long j = i >> CPUSET_SHIFT;
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if (j >= cpuset_nentries) {
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errno = EINVAL;
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return -1;
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}
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2012-11-15 12:06:41 +01:00
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return ((1 << (unsigned int)(i & CPUSET_MASK)) & c->bits[j]) != 0;
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2011-02-14 20:36:03 +01:00
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}
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int
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_cpuset_set(cpuid_t i, cpuset_t *c)
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{
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const unsigned long j = i >> CPUSET_SHIFT;
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if (j >= cpuset_nentries) {
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errno = EINVAL;
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return -1;
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}
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2012-11-15 12:06:41 +01:00
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c->bits[j] |= 1 << (unsigned int)(i & CPUSET_MASK);
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2011-02-14 20:36:03 +01:00
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return 0;
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}
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int
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_cpuset_clr(cpuid_t i, cpuset_t *c)
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{
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const unsigned long j = i >> CPUSET_SHIFT;
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if (j >= cpuset_nentries) {
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errno = EINVAL;
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return -1;
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}
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2012-11-15 12:06:41 +01:00
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c->bits[j] &= ~(1 << (unsigned int)(i & CPUSET_MASK));
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2011-02-14 20:36:03 +01:00
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return 0;
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}
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cpuset_t *
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_cpuset_create(void)
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{
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if (cpuset_size == 0) {
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static int mib[2] = { CTL_HW, HW_NCPU };
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size_t len;
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u_int nc;
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len = sizeof(nc);
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2012-11-15 12:06:41 +01:00
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if (sysctl(mib, (unsigned int)__arraycount(mib), &nc, &len,
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NULL, 0) == -1)
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2011-02-14 20:36:03 +01:00
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return NULL;
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cpuset_nentries = CPUSET_NENTRIES(nc);
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cpuset_size = CPUSET_SIZE(cpuset_nentries);
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}
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return calloc(1, cpuset_size);
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}
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void
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_cpuset_destroy(cpuset_t *c)
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{
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free(c);
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}
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#endif
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#endif
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